EP0040283A1 - Process for the production of spherical granules from molten mineral material, granules produced thereby and their applications - Google Patents

Process for the production of spherical granules from molten mineral material, granules produced thereby and their applications Download PDF

Info

Publication number
EP0040283A1
EP0040283A1 EP19800401356 EP80401356A EP0040283A1 EP 0040283 A1 EP0040283 A1 EP 0040283A1 EP 19800401356 EP19800401356 EP 19800401356 EP 80401356 A EP80401356 A EP 80401356A EP 0040283 A1 EP0040283 A1 EP 0040283A1
Authority
EP
European Patent Office
Prior art keywords
slag
granules
molten
blades
balls
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19800401356
Other languages
German (de)
French (fr)
Inventor
Francis Gagneraud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0040283A1 publication Critical patent/EP0040283A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/10—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying using centrifugal force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
    • B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B19/00—Other methods of shaping glass
    • C03B19/10—Forming beads
    • C03B19/1005—Forming solid beads
    • C03B19/1015—Forming solid beads by using centrifugal force or by pouring molten glass onto a rotating cutting body, e.g. shredding
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/02—Physical or chemical treatment of slags
    • C21B2400/022—Methods of cooling or quenching molten slag
    • C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/052—Apparatus features including rotating parts
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/052—Apparatus features including rotating parts
    • C21B2400/056—Drums whereby slag is poured on or in between
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies

Definitions

  • the present invention relates to the field of treatment of mineral matter and molten metals and relates to a process for obtaining granules with a high sphericity index, in particular beads, from molten mineral products such as: molten silicates, metals and alloys in the liquid state, molten glass and clinker, and especially: metallurgical slag including blast furnace slag and steel slag, phosphate or not, molten slag, etc.
  • molten mineral products such as: molten silicates, metals and alloys in the liquid state, molten glass and clinker, and especially: metallurgical slag including blast furnace slag and steel slag, phosphate or not, molten slag, etc.
  • the molten material on a rotary device without ensuring any cooling, by liquid or gaseous means, between the material flow and the receiving area where the materials pile up after shredding by the rotary device and projection into the atmosphere.
  • the rotary system is designed to withstand the rise in temperature.
  • a solid body is used which rotates along a horizontal axis.
  • This body can be full or hollow, thick-walled, or hollowed out. If it is polygonal, the edges are used to cut the molten material; in the case where a full or hollow cylindrical body is used, it must be provided with blades, the number of which can vary from 2 to 16 according to requirements (French patents n ° 80.08368 and 80.08477 of 15 and 16 April 1980).
  • the rotary system When the rotary system is a hollow body, it advantageously consists of two flanges on which are supported thick blades, the number of which may also vary. In each case, the ends of the edges, blades or blades describe surfaces of cylindrical revolution whose diameter can vary, for example from 150 to 800 mm.
  • the characteristics of the rotating body length, diameter of the surface of revolution, number of blades of cutting elements, speed of rotation, etc.
  • spheroidal materials whose dimensions are between 0 , 1 and 5 mm, or sometimes more up to 10 mm.
  • the peripheral speed of the blades or cutting elements does not drop below 10 meters / second, the number of passages of blades per second in front of a fixed point (by example the end of a plate., power supply if there is one as said below) being at least 40.
  • the molten material is poured directly from its ladle, an evacuation channel or a reser see intermediate overflow on the body rotating at high speed.
  • the stream of molten material is sent on an inclined plane or feeding table of the thick steel plate type, in a manner known per se but here without ensuring cooling by circulation of water, before the flow on the rotary system. It is thus possible to regularize the width and the thickness of the blade of material arriving on the rotating body.
  • an LD steel slag still comprising liquid steel in suspension
  • an uncooled feed plate with a flow rate of 10 to 60 tonnes per meter of length of rotary system and arriving at a full cylinder equipped with 12 blades and rotating at the speed of 900 revolutions per minute.
  • the ends of the blades described a cylindrical surface of revolution of 600 mm in diameter.
  • the peripheral speed of the blade tips was 28.3 m / second and the frequency of the blades passing in front of the table end was 180 strokes per second.
  • the LD molten slag contained in suspension liquid metal which had not been decanted. There was obtained on the receiving area, after shredding of the material by the rotary system and projection of the particles in the atmosphere, a material composed mainly of spheroidal granules not exceeding 5 mm; the granules with the greatest sphericity index were less than 3 mm in diameter; there were no granules smaller than 0.1 mm.
  • the non-magnetic granules composed entirely of slag, had the appearance of compact beads with a vitrified surface appearance, of great resistance to impact and to crushing; their microhardness index was between 600 and 1000 Vickers or between 6 and 7 on the Mohs scale.
  • screening it was possible to obtain very tight particle size classes such as: 0.1 to 0.25 mm; 0.25 to 0.50 mm; 0.50 to 1 mm; 1 to 2 mm; 2, 3 mm ... etc.
  • the products obtained according to the process of the invention have interesting physico-chemical characteristics.
  • the granules are very compact because no expanding agent has been used.
  • the volumetric mass of the grains is between 3,000 and 3,500 kg / m 3 depending on the particle size classes, the specific mass of the material being slightly greater than 3,500 kg / m 3 .
  • the specific gravity is greater because they are composed of hardened metal having a microhardness which exceeds that of the slag granules.
  • the grains obtained have a vitrified surface and do not disintegrate, even after immersion in water. This stability is due to the rapid cooling of the material.
  • the granules with a high sphericity index can be used in peening operations or surface preparation by hammering.
  • Dairy-based granules advantageously replace spherical glass in the manufacture of heat accumulators, solar energy collectors due to their high resistance to crushing (200 to 1000 Megapascals depending on the particle size class). They can be used in the manufacture of micro-concrete and refractory materials; thus, they can be incorporated into high-strength concretes whose surfaces subjected to wear must remain smooth like those used for hydraulic overflows and leakage channels whose surfaces must remain smooth.
  • the products according to the invention can be recycled in the agglomeration chain or even be used as "delay" fertilizer when it is phosphate milk.
  • the abovementioned process applies to all molten metals or alloys as well as to molten mineral materials such as glasses, ceramics, clinker of molten cement and particularly to medium and high basicity products.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Metallurgy (AREA)
  • Furnace Details (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Manufacture Of Iron (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Glanulating (AREA)

Abstract

L'invention a trait à la préparation de granules sphéroïdaux ou bialles à partir de matières minérales et métaux en fusion. Selon le procédé, on fait déverser la matière fondue sur un cylindre rotatif, non refroidi, après passage éventuel sur table ou plaque inclinée d'alimentation, sans assurer aucun refroidissement, par moyen liquide ou gazeux, entre la coulée de matière et l'aire de réception où s'entassent les granules durs et sphériques qu'il suffit de classifier par criblage. Application, notamment, à tous types de laitiers, spécialement aux laitiers d'acierie basiques, phosphatés ou non.The invention relates to the preparation of spheroidal granules or balls from mineral materials and molten metals. According to the method, the molten material is poured onto a rotary cylinder, uncooled, after possible passage on a table or inclined feed plate, without ensuring any cooling, by liquid or gaseous means, between the material flow and the area of reception where the hard and spherical granules pile up which it suffices to classify by screening. Application, in particular, to all types of slag, especially to basic steel slag, phosphate or not.

Description

La présente invention a trait au domaine du traitement de matières minérales et de métaux en fusion et concerne un procédé d'obtention de granules d'indice de sphéricité élevé, notamment de billes, à partir de produits minéraux fondus tels que : silicates fondus, métaux et alliages à l'état liquide,verres et clinker en fusion, et tout spécialement : laitiers métallurgiques dont les laitiers de haut-fourneaux et d'acieries, phosphatés ou non, scories fondues, etc.The present invention relates to the field of treatment of mineral matter and molten metals and relates to a process for obtaining granules with a high sphericity index, in particular beads, from molten mineral products such as: molten silicates, metals and alloys in the liquid state, molten glass and clinker, and especially: metallurgical slag including blast furnace slag and steel slag, phosphate or not, molten slag, etc.

On sait qu'un certain nombre de matières minérales, dont en particulier les laitiers non phosphatés d'acieries (l'expression "laitiers" englobant également les scories)représentent de très gros tonnages de résidus dont seule une faible partie est utilisée. Les traitements effectués jusqu'à ce jour sur ces matériaux permettent d'obtenir des produits dont la valeur d'usage est relativement faible par exemple, granulats pour la confection de remblais et de couches de chaussées, produits d'amendement pour les sols.It is known that a certain number of mineral materials, in particular the non-phosphate slag from steelworks (the expression "slag" also including slag) represents very large tonnages of residues of which only a small part is used. The treatments carried out to date on these materials make it possible to obtain products whose use value is relatively low, for example, aggregates for making embankments and road layers, soil improvers.

Dans les procédés destinés à obtenir des matériaux de-granulométrie réduite à partir de matériaux fondus tels que des laitiers, on fait généralement intervenir une dispersion sur tambour à ailettes, refroidi convenablement, et l'on assure un refroidissement relativement intense de la masse fondue au moyen d'aspersion d'eau et/ou de jets d'air froid. Les granulats de laitier solidifié ainsi obtenus ont une structure poreuse et expansée, en particulier lorsqu'on incorpore à la masse fondue des agents porophores.In the processes intended to obtain materials of reduced particle size from molten materials such as slag, there is generally involved a dispersion on a finned drum, suitably cooled, and a relatively intense cooling of the melt is ensured. means of spraying water and / or cold air jets. The solidified slag aggregates thus obtained have a porous and expanded structure, in particular when porophoric agents are incorporated into the melt.

Lorsqu'on désire obtenir, à partir des laitiers fondus, des produits non poreux et durs, de structure compacte, comme par exemple des sables de décapage de grande valeur d'usage, il faut procéder à des concassages et broyages des matériaux récupérés en fosse : or, ces opérations consomment une importante quantité d'énergie et provoquent une usure démesurée des appareils mis en oeuvre du fait de l'extrême abrasivité des matériaux.When it is desired to obtain, from molten slag, non-porous and hard products, of compact structure, such as pickling sands of great value for use, it is necessary to crush and grind the materials recovered in the pit : However, these operations consume a large amount of energy and cause excessive wear of the devices used due to the extreme abrasiveness of the materials.

Il a maintenant été trouvé, à la suite d'essais industriels, qu'il était possible d'obtenir directement à partir des matières minérales en fusion, sans nécessité de concassage ou broyage ultérieur, des produits sphériques très durs analogues à des billes dont les diamètres peuvent descendre jusqu'à une fourchette.de granulométrie très faible et resserrée.It has now been found, following industrial tests, that it was possible to obtain directly from the molten mineral materials, without the need for subsequent crushing or grinding, very hard spherical products similar to balls whose diameters can go down to a very small and tightened size range.

Selon le nouveau procédé de l'invention, on fait déverser la matière fondue sur un dispositif rotatif sans assurer aucun refroidissement, par moyen liquide ou gazeux, entre la coulée de matière et l'aire de réception où s'entassent les matériaux après déchiquetage par le dispositif rotatif et projection dans l'atmosphère.According to the new process of the invention, the molten material on a rotary device without ensuring any cooling, by liquid or gaseous means, between the material flow and the receiving area where the materials pile up after shredding by the rotary device and projection into the atmosphere.

On a ainsi constaté qu'en opérant sans aucun apport d'agent de refroidissement, tant sur le trajet de déversement de la masse fondue qu'au niveau du système rotatif, et à condition de maintenir une vitesse minimum pour ce dernier, on obtenait en fosse ou sur l'aire de réception un produit constitué quasi-exclusivement de billes très dures ou d'éléments sphéroidaux offrant de larges possibilités d'application.It has thus been found that by operating without any addition of coolant, both on the path for pouring the molten mass and at the level of the rotary system, and provided that a minimum speed is maintained for the latter, pit or on the receiving area a product consisting almost exclusively of very hard balls or spheroidal elements offering wide possibilities of application.

Le système rotatif est réalisé de façon à résister à l'élévation de température. En pratique on utilise un corps solide tournant suivant un axe horizontal. Ce corps peut être plein ou creux, à paroi épaisse, ou évidé. S'il est de forme polygonale, les arêtes servent au découpage de la matière en fusion ; dans le cas où l'on utilise un corps cylindrique plein ou creux, il faut le munir de pales dont le nombre peut varier de 2 à 16 suivant les besoins (brevets français n° 80.08368 et 80.08477 des 15 et 16 avril 1980).The rotary system is designed to withstand the rise in temperature. In practice, a solid body is used which rotates along a horizontal axis. This body can be full or hollow, thick-walled, or hollowed out. If it is polygonal, the edges are used to cut the molten material; in the case where a full or hollow cylindrical body is used, it must be provided with blades, the number of which can vary from 2 to 16 according to requirements (French patents n ° 80.08368 and 80.08477 of 15 and 16 April 1980).

Lorsque le système rotatif est un corps évidé, celui-ci se compose avantageusement de deux flasques sur lesquels s'appuient des lames épaisses dont le nombre peut également varier. Dans chaque cas, les extrémités des arêtes,des pales ou des lames, décrivent des surfaces de révolution cylindriques dont le diamètre peut varier par exemple de 150 à 800 mm.When the rotary system is a hollow body, it advantageously consists of two flanges on which are supported thick blades, the number of which may also vary. In each case, the ends of the edges, blades or blades describe surfaces of cylindrical revolution whose diameter can vary, for example from 150 to 800 mm.

En choisissant convenablement les caractéristiques du corps tournant (longueur, diamètre de la surface de révolution, nombre de pales d'éléments tranchants, vitesse de rotation...) il est possible d'obtenir des matériaux sphéroldaux dont les dimensions s'étagent entre 0,1 et 5 mm, ou parfois plus jusqu'à 10 mm. Quand on désire produire des billes de diamètre inférieur à 5 mm, il est nécessaire que la vitesse périphérique des pales ou éléments tranchants ne descende pas en dessous de 10 mètres/seconde, le nombre de passages de pales par seconde devant un point fixe (par exemple l'extrémité d'une plaque.,d'alimentation s'il y en a une comme dit ci-après) étant au minimum de 40.By suitably choosing the characteristics of the rotating body (length, diameter of the surface of revolution, number of blades of cutting elements, speed of rotation, etc.) it is possible to obtain spheroidal materials whose dimensions are between 0 , 1 and 5 mm, or sometimes more up to 10 mm. When it is desired to produce balls with a diameter of less than 5 mm, it is necessary that the peripheral speed of the blades or cutting elements does not drop below 10 meters / second, the number of passages of blades per second in front of a fixed point (by example the end of a plate., power supply if there is one as said below) being at least 40.

En pratique, la matière en fusion est déversée directement de sa poche de coulée, d'une rigole d'évacuation ou encore d'un réservoir intermédiaire à débordement sur le corps tournant à grande vitesse. Selon une variante, le flot de matière fondue est envoyé sur un plan incliné ou table d'alimentation du type plaque d'acier de forte épaisseur, de façon connue en soi mais ici sans assurer de refroidissement par circulation d'eau, avant l'écoulement sur le système rotatif. On peut ainsi régulariser la largeur et l'épaisseur de la lame de matière arrivant sur le corps tournant.In practice, the molten material is poured directly from its ladle, an evacuation channel or a reser see intermediate overflow on the body rotating at high speed. According to a variant, the stream of molten material is sent on an inclined plane or feeding table of the thick steel plate type, in a manner known per se but here without ensuring cooling by circulation of water, before the flow on the rotary system. It is thus possible to regularize the width and the thickness of the blade of material arriving on the rotating body.

Durant la mise en oeuvre du procédé, on ne constate pas de formation de poussières ni d'ailleurs la production de vapeur d'eau du fait qu'aucune injection d'eau de refroidissement n'est pratiquée dans la masse de matière fondue.During the implementation of the process, there is no formation of dust nor, moreover, the production of water vapor because no injection of cooling water is practiced in the mass of molten material.

A titre d'exemple non limitatif de réalisation, on a été amené à traiter un laitier d'acierie LD (comportant encore de l'acier liquide en suspension) coulant sur une plaque d'alimentation non refroidie avec un débit de 10 à 60 tonnes par mètre de longueur de système rotatif et parvenant à un cylindre plein équipé de 12 pales et tournant à la vitesse de 900 tours par minute. Les extrémités des pales décrivaient une surface de révolution cylindrique de 600 mm de diamètre. La vitesse périphérique des extrémités des pales était de 28,3 m/seconde et la fréquence de passage des pales devant l'extrémité de la table était de 180 coups par seconde.As a nonlimiting example of an embodiment, it was necessary to treat an LD steel slag (still comprising liquid steel in suspension) flowing on an uncooled feed plate with a flow rate of 10 to 60 tonnes per meter of length of rotary system and arriving at a full cylinder equipped with 12 blades and rotating at the speed of 900 revolutions per minute. The ends of the blades described a cylindrical surface of revolution of 600 mm in diameter. The peripheral speed of the blade tips was 28.3 m / second and the frequency of the blades passing in front of the table end was 180 strokes per second.

Le laitier LD en fusion contenait en suspension du métal liquide non décanté. On a obtenu sur l'aire de réception, après déchiquetage de la matière par le système rotatif et projection des particules dans l'atmosphère, un matériau composé en majeure partie de granules sphéroidaux ne dépassant pas 5 mm ; les granules présentant le plus grand indice de sphéricité étaient de diamètre inférieur à 3 mm ; il n'y avait pas de granules de dimension inférieure à 0, 1 mm.The LD molten slag contained in suspension liquid metal which had not been decanted. There was obtained on the receiving area, after shredding of the material by the rotary system and projection of the particles in the atmosphere, a material composed mainly of spheroidal granules not exceeding 5 mm; the granules with the greatest sphericity index were less than 3 mm in diameter; there were no granules smaller than 0.1 mm.

Par simple séparation magnétique on a extrait les particules métalliques et les particules riches en oxyde ferromagnétique.By simple magnetic separation, the metallic particles and the particles rich in ferromagnetic oxide were extracted.

Les granules non magnétiques, composés uniquement de laitier, avaient l'apparence de billes compactes à aspect vitrifié en surface, de grande résistance aux chocs et à l'écrasement ; leur indice de microdureté était compris entre 600 et 1000 Vickers soit entre 6 et 7 à l'échelle Mohs. Par criblage on a pu obtenir des classes granulométriques très resserrées telles que : 0,1 à 0,25 mm ; 0,25 à 0,50 mm; 0,50 à 1 mm ; 1 à 2 mm ; 2,à 3 mm... etc.The non-magnetic granules, composed entirely of slag, had the appearance of compact beads with a vitrified surface appearance, of great resistance to impact and to crushing; their microhardness index was between 600 and 1000 Vickers or between 6 and 7 on the Mohs scale. By screening it was possible to obtain very tight particle size classes such as: 0.1 to 0.25 mm; 0.25 to 0.50 mm; 0.50 to 1 mm; 1 to 2 mm; 2, 3 mm ... etc.

Les produits obtenus selon le procédé de l'invention présentent des caractéristiques physico-chimiques intéressantes. En particulier, dans le cas de laitiers, les granules sont très compacts du fait qu'aucun agent expansif n'a été utilisé. La masse volumétrique des grains est comprise entre 3 000 et 3 500 kg/m3 suivant les classes granulométriques, la masse spécifique de la matière étant légèrement supérieure à 3 500 kg/m3. Dans le cas des granules métalliques, la masse spécifique est plus importante du fait qu'ils sont composés de métal trempé présentant une microdureté qui dépasse celle des granules de laitiers. Les grains obtenus ont une surface vitrifiée et ne se désagrègent pas, même après immersion dans l'eau. Cette stabilité est due au refroidissement rapide de la matière.The products obtained according to the process of the invention have interesting physico-chemical characteristics. In particular, in the case of slag, the granules are very compact because no expanding agent has been used. The volumetric mass of the grains is between 3,000 and 3,500 kg / m 3 depending on the particle size classes, the specific mass of the material being slightly greater than 3,500 kg / m 3 . In the case of metal granules, the specific gravity is greater because they are composed of hardened metal having a microhardness which exceeds that of the slag granules. The grains obtained have a vitrified surface and do not disintegrate, even after immersion in water. This stability is due to the rapid cooling of the material.

Les domaines d'applications de ces granules sphéroidaux sont très variés. Quelle que soit leur composition (métalliques ou à base de laitier) les granules de faible indice de sphéricité peuvent être utilisés comme produits de décapage des surfaces.The fields of application of these spheroidal granules are very varied. Whatever their composition (metallic or slag-based), the granules with a low sphericity index can be used as products for pickling surfaces.

Les granules d'indice de sphéricité élevé sont utilisables dans les opérations de "peening" ou préparation de surface par martelage. Les granules à base de laitiers remplacent avantageusement le verre sphérulaire dans la fabrication des accumulateurs de chaleur, des capteurs d'énergie solaire par suite de leur grande résistance à l'écrasement (200 à 1000 Mégapascals selon la classe granulométrique). Ils peuvent entrer dans la confection de microbétons et de matières réfractaires ; ainsi on peut les incorporer dans des bétons à haute résistance dont les surfaces soumises à l'usure doivent rester lisses comme ceux utilisés pour les déversoirs hydrauliques et les canaux de fuite dont les surfaces doivent rester lisses.The granules with a high sphericity index can be used in peening operations or surface preparation by hammering. Dairy-based granules advantageously replace spherical glass in the manufacture of heat accumulators, solar energy collectors due to their high resistance to crushing (200 to 1000 Megapascals depending on the particle size class). They can be used in the manufacture of micro-concrete and refractory materials; thus, they can be incorporated into high-strength concretes whose surfaces subjected to wear must remain smooth like those used for hydraulic overflows and leakage channels whose surfaces must remain smooth.

Par ailleurs, les produits selon l'invention peuvent être recyclés dans la chaîne d'agglomération ou encore être utilisés comme engrais "retard" lorsqu'il s'agit de laitiers phosphatés.Furthermore, the products according to the invention can be recycled in the agglomeration chain or even be used as "delay" fertilizer when it is phosphate milk.

Bien qu'illustré, dans l'exemple ci-dessus, pour le traitement de laitiers métallurgiques, le procédé susvisé s'applique à tous métaux ou alliages fondus ainsi qu'aux matières minérales en fusion telles que verres, céramiques, clinker de ciment fondu et particulièrement aux produits de moyenne et forte basicité.Although illustrated, in the example above, for the treatment of metallurgical slag, the abovementioned process applies to all molten metals or alloys as well as to molten mineral materials such as glasses, ceramics, clinker of molten cement and particularly to medium and high basicity products.

Claims (6)

1. Procédé de production de granules sphéroïdaux d'indice de sphéricité élevé, notamment de billes à partir de matières minérales et métaux en fusion dont tout. spécialement des laitiers et scories métallurgiques, caractérisé en ce que la matière fondue est déversée sur un dispositif rotatif projetant les particules déchiquetées dans l'atmosphère, ces dernières étant récupérées sur une aire de réception directement sous forme majoritaire de billes, sans qu'aucun moyen de refroidissement, gazeux ou liquide, ne soit prévu entre la coulée de la masse fondue et la réception en fosse.1. Process for the production of spheroidal granules with a high sphericity index, in particular beads from mineral matter and molten metals, all of which. especially slag and metallurgical slag, characterized in that the molten material is poured onto a rotary device projecting the shredded particles into the atmosphere, the latter being collected on a reception area directly in the majority form of balls, without any means cooling, gas or liquid, is not provided between the casting of the melt and the reception in the pit. 2. Procédé selon la revendication 1, caractérisé en ce que la matière fondue tombe sur une plaque inclinée (ou table d'alimentation) servant de guide, non refroidi, avant son arrivée sur le dispositif rotatif.2. Method according to claim 1, characterized in that the molten material falls on an inclined plate (or feeding table) serving as a guide, uncooled, before its arrival on the rotary device. 3. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le système rotatif est constitué par un corps cylindrique ou polygonal plein ou creux à parois épaisses, muni de pales ou lames dont la vitesse périphérique est d'au moins 10 mètres/ seconde.3. Method according to any one of claims 1 to 3, characterized in that the rotary system consists of a solid or hollow cylindrical or polygonal body with thick walls, provided with blades or blades whose peripheral speed is at least 10 meters / second. 4. Procédé selon la revendication 3, caractérisé en ce qùe le corps rotatif est évidé et se compose de deux flasques sur lesquels s'appuyent des lames horizontales épaisses dont les extrémités décrivent des surfaces de révolution cylindriques de diamètre 150 à 800 mm.4. Method according to claim 3, characterized in that the rotary body is hollowed out and consists of two flanges on which are supported thick horizontal blades whose ends describe cylindrical surfaces of revolution of diameter 150 to 800 mm. 5. Billes de matières minérales, notamment de laitiers, . obtenues selon le procédé de l'une quelconque des revendications 1 à 4, d'indice de dureté aù moins égal à 6 (échelle Mohs), aptes à être criblées selon une classification granulométrique très resserrée entre 0, et 5 mm.5. Balls of mineral matter, especially slag,. obtained according to the method of any one of claims 1 to 4, with a hardness index at least equal to 6 (Mohs scale), capable of being screened according to a very tight particle size classification between 0 and 5 mm. 6. Application des billes selon la revendication 5 comme. agents de décapage et traitement de surfaces métalliques, additifs pour bétons et mortiers réfractaires, moyens de substitution au verre sphérulaire et engrais à action retard dans le cas de laitiers phosphatés.6. Application of the beads according to claim 5 as. pickling and treatment agents for metal surfaces, additives for refractory concretes and mortars, means of substitution for spherular glass and delayed action fertilizers in the case of phosphate slag.
EP19800401356 1980-05-20 1980-09-24 Process for the production of spherical granules from molten mineral material, granules produced thereby and their applications Withdrawn EP0040283A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8011199 1980-05-20
FR8011199A FR2482872A1 (en) 1980-05-20 1980-05-20 PRODUCTION OF SPHEROIDAL GRANULES OR BALLS FROM FUSION MINERAL MATERIALS

Publications (1)

Publication Number Publication Date
EP0040283A1 true EP0040283A1 (en) 1981-11-25

Family

ID=9242149

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800401356 Withdrawn EP0040283A1 (en) 1980-05-20 1980-09-24 Process for the production of spherical granules from molten mineral material, granules produced thereby and their applications

Country Status (9)

Country Link
US (1) US4348340A (en)
EP (1) EP0040283A1 (en)
JP (1) JPS5710080A (en)
AR (1) AR225322A1 (en)
BR (1) BR8006279A (en)
CA (1) CA1148359A (en)
ES (1) ES495578A0 (en)
FR (1) FR2482872A1 (en)
MX (1) MX155088A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0113618B1 (en) * 1982-12-13 1987-07-08 Imphy S.A. Process for the production of a pulverent material for use in obtaining hydraulic binders, and means therefore

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2516282Y2 (en) * 1990-04-27 1996-11-06 日産ディーゼル工業株式会社 Fuel tank for vehicle
US5855666A (en) * 1996-12-24 1999-01-05 Cement-Lock Group, L.L.C. Process for preparing environmentally stable products by the remediation of contaminated sediments and soils
US5803894A (en) * 1996-12-24 1998-09-08 Cement-Lock L.L.C. Process for preparing enviromentally stable products by the remediation of contaminated sediments and soils
JP6388948B2 (en) * 2013-09-05 2018-09-12 ウヴォン ホールディング エービー Molten metal granulation
FI128181B (en) * 2015-12-18 2019-11-29 Clean Steel Pori Oy Method for cleaning heat transfer surfaces in a combustion boiler

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1173580A (en) * 1956-04-09 1959-02-26 Method and apparatus for manufacturing aggregates such as pumice stone
FR1551368A (en) * 1967-12-28 1968-12-27
DE1916230A1 (en) * 1969-03-29 1972-02-24 Schmitz Rolf Guenther Granulation of high melting pt materials - by impact dispersion

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1047370A (en) * 1910-02-28 1912-12-17 John G Berquist Process of disintegrating molten slag.
US1471421A (en) * 1919-12-16 1923-10-23 Det Norske Aktieselskab Elektr Process of producing porous material
US1924728A (en) * 1929-02-27 1933-08-29 Tracy Bartholomew Treatment of slag
US2520168A (en) * 1944-09-22 1950-08-29 Johns Manville Method and apparatus for fiberizing molten material
US3594142A (en) * 1968-06-05 1971-07-20 Nat Slag Ltd Processes for the pelletization of metallurgical slag
US3709670A (en) * 1970-09-10 1973-01-09 H Eriksen Method, apparatus and system for fiberizing molten mineral material
LU73623A1 (en) * 1975-10-21 1977-05-24
US4256677A (en) * 1976-04-12 1981-03-17 Magnavox Government And Industrial Electronics Co. Apparatus and method for making small spheres
US4215084A (en) * 1978-05-03 1980-07-29 The Battelle Development Corporation Method and apparatus for producing flake particles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1173580A (en) * 1956-04-09 1959-02-26 Method and apparatus for manufacturing aggregates such as pumice stone
FR1551368A (en) * 1967-12-28 1968-12-27
DE1916230A1 (en) * 1969-03-29 1972-02-24 Schmitz Rolf Guenther Granulation of high melting pt materials - by impact dispersion

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0113618B1 (en) * 1982-12-13 1987-07-08 Imphy S.A. Process for the production of a pulverent material for use in obtaining hydraulic binders, and means therefore

Also Published As

Publication number Publication date
MX155088A (en) 1988-01-26
FR2482872A1 (en) 1981-11-27
US4348340A (en) 1982-09-07
BR8006279A (en) 1982-06-01
JPS5710080A (en) 1982-01-19
AR225322A1 (en) 1982-03-15
CA1148359A (en) 1983-06-21
ES8106242A1 (en) 1981-06-16
FR2482872B3 (en) 1983-01-21
ES495578A0 (en) 1981-06-16

Similar Documents

Publication Publication Date Title
US4063942A (en) Metal flake product suited for the production of metal powder for powder metallurgical purposes, and a process for manufacturing the product
CN105722803A (en) Process and apparatus for dry granulation of slag with reduced formation of slag wool
EP0040283A1 (en) Process for the production of spherical granules from molten mineral material, granules produced thereby and their applications
WO2019211268A1 (en) Composite tooth with frustoconical insert
CH615850A5 (en)
MX2011008947A (en) Production of spheroidal metal particles.
FR2554371A1 (en) Method for producing ultrafine solid particles of metal
KR100653810B1 (en) Method of Producing Homogeneous Mixture of Mix Material Consisting of Powders of Hard Material and of Binder Metal
FR2560087A1 (en) BORE NITRIDE SURFACE ATOMIZATION ADJUSTMENT
EP0131668B1 (en) Process for obtaining granules from steelwork slag
SU1255041A3 (en) Method of casting metal melt in ingots or blanks
US2129702A (en) Process for making metal products
DE1916230A1 (en) Granulation of high melting pt materials - by impact dispersion
US2129703A (en) Apparatus for producing metal products
FR2563131A1 (en) METHOD AND APPARATUS FOR ATOMIZING MOLTEN MASS FROM NARROW COUPLING ADJUSTMENT AND PRODUCT THUS OBTAINED
JP2004067396A (en) Method of manufacturing blast furnace slag fine aggregate
US4279843A (en) Process for making uniform size particles
JP4264288B2 (en) Production method of asphalt aggregate
BE1005883A5 (en) Method for manufacturing of cement and slag aggregate steel obtained by air blowing and a device granulating.
FR2472017A1 (en) Vitreous blast furnace slag mfg. plant - where molten slag is poured into deep grooves between metal plates for rapid solidification
EP4090779B1 (en) Forged grinding balls for semi-autogenous grinder
BE660609A (en)
FR2646169A1 (en) Device for pelletising and/or granulating molten inorganic materials
JP3808930B2 (en) Melt forming method and apparatus
JPS6158845A (en) Manufacture of special form grain slag

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE GB IT LU NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19821031